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155
Connecting More Than One HFU
Section 5-2
If the communications line is disconnected or the PLC power supply turns
OFF during programless communications, a programless communications
error will occur after the following times have expired.
Note
If a programless communications error occurs because the PLC power supply
turns OFF when using the NT Link (1: N) protocol, the error can be cleared by
turn ON the PLC power supply.
5-2
Connecting More Than One HFU
5-2-1
SYSMAC CS/CJ-series PLCs
Up to eight Advanced Units (HFU) can be connected to one communications
port on a Serial Communications Unit or Serial Communications Board. Use
the following models when connecting more than one HFU.
1,2,3...
1.
Connect the EJ1 and PLC.
Always set the communications unit numbers of the HFU in order from 0
through 7, or 32 to 39 if using a version
Unit, and set the communi-
cations unit numbers of the Basic Units connected to each HFU to a differ-
ent communications unit number than the HFU. This restriction does not
apply if using a version
Unit when the communications unit number
for the HFU is set to a number from No. 32 to 39.
■
Example
If the communications unit number of the HFU is set to 1:
Set the unit numbers of the Basic Units to any number other than 1, i.e.,
from 0 to 31 but excluding 1.
Set the unit numbers for other HFUs to a number other than 1, for example,
0, 2, 3, 4, 5, 6, or 7. A single HFU can manage a maximum of 32 Basic
Units. When connecting 16 or more Basic Units, use distributed placement
because 16 would exceed the maximum number of side-by-side connec-
tions.
Programless
communications protocol
Maximum time until programless communications
error
NT Link (1: N)
30 s (See note.)
MC Protocol (Format 5)
AnA/AnU CPU Common
Commands
Programless Communications Receive Wait Times
×
3
(6 s for the default setting)
V1.1
Serial Communications Units
CJ1W-SCU31-V1
Port 1 of CJ1W-SCU41-V1
CS1W-SCU31-V1
Serial Communications Board
Port 2 of CS1W-SCB41-V1
EJ1N-HFU
EJ1N-HFUA-NFLK
EJ1N-HFUB-NFLK
V1.2
V1.2
Summary of Contents for EJ1 EtherCAT
Page 2: ...EJ1 Modular Temperature Controllers User s Manual Revised July 2008 ...
Page 3: ...iv ...
Page 19: ...xx ...
Page 213: ...188 Detailed Description of Services Section 6 4 ...
Page 227: ...202 Detailed Description of Services Section 7 5 ...
Page 303: ...278 Index ...
Page 305: ......